The justification matters less than the ever present belief that https://en.m.wikipedia.org/wiki/There_is_no_alternative

This is largely why the French Revolution was so vehemently opposed by foreign leaders and why they tried almost everything to get another king on the throne in France or to destroy it trying. It was a living, breathing, functioning and preferable alternative to monarchy. If not clamped down upon it was only a matter of time until it spread.